Pressure gauge



Jan. i, 1.929a

B. F. coRwlN PRESSURE GAUGE Filed Aug. 1l, 1926 n n v1 lill .INVENTOR Bfg/am/rl F C orwm BY l LA' /f'5 .ATTORNEYS llllll I. l l l1 l 1 l I IETHIHII u .Illu h n n |||||l|||hlhhllllhuwllhtlrlh ndllvnhnu |||||H4||||||IHH| ..l I lill al) la l 1|,

Patented Jan. l, 1929.

' unirse stm-msi BENJAMNF' CORFLN,l AO11" BROOKLYNQLNEW YORK?.

PRESSURE GAUGE?? Application. filed August 11, 1926.' Serial No. 128,542..`

This invention relates to improvements in-` be operated either open to the atmosphere or closed and whichy maybe so constructed that a `single scale maybe used to give readings equal to those of amuch longerscale.

As` a still further'vob'ject'of this inventionx this deviceis so constructed that it'may be readily calibrated. y

This invention resides substantially inthe combination, construction, arrangement and relative location ofparts as will be clearly described -in` the followingesp'eciiication.

Referring to the drawings in which the same reference numerals will be used throughout the several views to indicate the same,

Figure l represents a side elevational View of my improved device,

Fig. 2 is a vertical cross sectional view of the structure of Fig. l,

Fig. 3 is an enlarged cross sectional view of the upper portion of the device with a control valve attached thereto,

Fig. 4 is a horizontal cross sectional view taken on the line 4 4 of Fig. 2 looking in the direction of the arrows.

Heretofore it has been necessary to construct sphygmomanometers of such a form that they are not easily carried about by a physician or those who find continual use for them. The device as usually constructed has been rather bulky and not readily adapted to be transported from place to place with convenience. It has also been found that the sphygmomanometers now in use very quickly get out of adjustment and do not give accurate readings and their usefulness is therefore impaired. By means of the herein disclosed structure a device will be constructed of about the size of a fountain pen which may be `readily carried in the vest pocket. The present construction is also adapted for readv calibration and the parts are so arranged that the device cannot readily get out of adjustment. By my construction it is also possible to operate my improved sphygmomanometer either under atmospheric'pressure or under a pressure greater' than' that when desired.

Referring now to the drawings the device consists ofa chamber `l which may be constructed 'of any suitable material and any suitableshape such as in the form. of a tube as disclosed. The lower end of the tubeis provided with a closure element 2of any suitable formkand 'material through which eX- tends the smal-l' tube Swhi'ch'prog'ects upwardly into thetu'be.` N ear the topl of the tube-is provided an integraltransverse wall 5 which closes E the tube iii-conjunction *withthevcl'osure 2 into a Vsealed chamber for the greaterl part of its length. A tube 4'is sealed inl the wall and lterminates ashort'distance above the closure-2. lA'suitablefscale,may beprovided on the tube 4 and calibrated in accordancewi`th the scale well known in this art.'

In the bottom ofthe vcl'iamber is provided asmall .pool of mercury@ which does not VeX-` jection 8 and is adapted to kclose the passage 9 when desired.

1n operation my improved device is attached to the wellknown tourniquet used in conjunction with devices of this nature already known inthe art. As is well known, these tourniquets consist of a. bandage like element within one end of which is provided a rubber sack. This' rubber sack is attached to the tube 3 of my device. The use of the present invention is exactly similar to the devices of this type known in the art. When it is desired to operate the device under atmospheric pressure, the needle valve l1 is unseated so that the tube 14V is open to the atmosphere. l/Vhen it is vfound necessary or desirable, a second scale may be placed on the tube 4 and suitably calibrated so that when the needle valve l1 is closed and a pressure is created within the tube as the mercury rises, the readings may be transformed from one scale. to the other. l

I am aware that many changes in the details of this construction and arrangement of parts will readily suggest themselves` to those skilled in the art and I do not therefore desire to be limited to the particular construction disclosed for purposes of illustration but rather to the spirit and the scope of my invention as I deiine it in my appended claims.

What I seek to 'secure by United States l Letters Patent is:

l. In a pressure gauge the combination comprising a hollow casing having a liquid therein, a closure at they lower end of the casing, a tube sealed in said casing having a scale thereon, said tube terminating near said closure at one end and open to the atmosphere at the other end and means communicating with saidv casing for conducting a fluid under pressure therein.

2; In a pressure gauge the combination With a casing having a Wall near the top thereof and a liquid therein of a tube sealed in said Wall and extending into said casing, a scale on said tube, a closure for the other end of the casing on Which the liquid rests to seal off the lower end of said tube and a second tube in said closure extending above the surface of the liquid.

3. In a pressure gauge the combination with a casing having a Wall near the top there- Vof and a liquid therein of a tube sealed in said Wall and extending into said casing, a scale on said tube, a closure for the` other end of the casing on which the liquid rests to seal oil the lower end of said tube, a second tube in said closure extending above the surface of the liquid and means on the top of said casing for controlling the pressure Within the casing.

4. In a pressure gauge Y the combination With a casing having a Wall near the top thereof and a. liquid therein of a tube sealed in said Wall and extending into said casing, a scale on said tube, a closure for the other end of the casing on which the liquid rests to seal off the lower end of said tube and means for changing the scale reading whereby the effective length of the scale is increased.

5. In a pressure gauge the combination with a casing having a Wall near the top thereof and a liquid therein of a tube sealed incsaid Wall and extending into said casing, a scale on said tube, a closure for the other end of the casing on which the liquid rests to seal off the loiver end of said tube and a valve on the top of said casing for venting it.

6. In a portable pressure gauge the combination of a closed casing having a valve at the top thereof, a graduated tube in said casing adapted to be opened to the atmosphere through said valve, a scale for said tube and means for creating a. pressure in said casing.

In testimony whereof I have hereunto set my hand on this 31st day of July, A. D., 19262 BENJAMIN F. CORWIN. 

